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Thread: Boss 302 Flex Fuel MPG

  1. #1
    Tuner in Training
    Join Date
    Feb 2021
    Posts
    11

    Boss 302 Flex Fuel MPG

    Does anyone have some advice on how to increase mpg for flex fuel/e85 on gen1 coyotes? I've read about changing the cam angles, but are there any other tips/tricks needed for FFV? Car is a Boss 302 with LU47 injectors.

  2. #2
    Advanced Tuner
    Join Date
    Feb 2012
    Location
    TEXAS
    Posts
    634
    According to the feds E85 offers 27% less energy then gasoline; we always say you need 33% more fuel hence pushing larger injectors. Since E85 makes less energy than gasoline it takes more of it to do the same job. I usually Increase my spark tables by min of 2* and i like to lean out my fuel at idle and Cruz on base fuel table; I log my knock sensors and and fuel trims and adjust accordingly.